WO2012169622A1 - Elément d'échange de chaleur, méthode de fabrication de celui-ci et échangeur de chaleur - Google Patents

Elément d'échange de chaleur, méthode de fabrication de celui-ci et échangeur de chaleur Download PDF

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Publication number
WO2012169622A1
WO2012169622A1 PCT/JP2012/064814 JP2012064814W WO2012169622A1 WO 2012169622 A1 WO2012169622 A1 WO 2012169622A1 JP 2012064814 W JP2012064814 W JP 2012064814W WO 2012169622 A1 WO2012169622 A1 WO 2012169622A1
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WIPO (PCT)
Prior art keywords
honeycomb structure
heat exchange
exchange member
honeycomb
fluid
Prior art date
Application number
PCT/JP2012/064814
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English (en)
Japanese (ja)
Inventor
能大 鈴木
博紀 高橋
竜生 川口
好正 近藤
Original Assignee
日本碍子株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 日本碍子株式会社 filed Critical 日本碍子株式会社
Priority to CN201280027515.XA priority Critical patent/CN103582798B/zh
Priority to JP2013519546A priority patent/JP6006204B2/ja
Priority to EP12797403.8A priority patent/EP2719987B1/fr
Publication of WO2012169622A1 publication Critical patent/WO2012169622A1/fr
Priority to US14/095,279 priority patent/US10527369B2/en

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/08—Constructions of heat-exchange apparatus characterised by the selection of particular materials of metal
    • F28F21/081—Heat exchange elements made from metals or metal alloys
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
    • B23P15/00—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass
    • B23P15/26—Making specific metal objects by operations not covered by a single other subclass or a group in this subclass heat exchangers or the like
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F21/00—Constructions of heat-exchange apparatus characterised by the selection of particular materials
    • F28F21/04—Constructions of heat-exchange apparatus characterised by the selection of particular materials of ceramic; of concrete; of natural stone
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F7/00—Elements not covered by group F28F1/00, F28F3/00 or F28F5/00
    • F28F7/02—Blocks traversed by passages for heat-exchange media
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
    • F28F2275/00—Fastening; Joining
    • F28F2275/14—Fastening; Joining by using form fitting connection, e.g. with tongue and groove
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/4935—Heat exchanger or boiler making

Definitions

  • the present invention relates to a heat exchange member that transfers heat of a first fluid (high temperature side) to a second fluid (low temperature side), a manufacturing method thereof, and a heat exchanger including the heat exchange member.
  • a heat-resistant metal such as stainless steel or a ceramic material having heat resistance, thermal shock and corrosion resistance is suitable.
  • Heat exchangers made of refractory metals are known, but refractory metals have problems such as high price and difficulty in processing, high density and weight, and low heat conduction.
  • Patent Document 1 discloses a ceramic heat exchanger in which a heating body channel is disposed from one end surface to the other end surface of a ceramic main body, and a heated body channel is formed in a direction orthogonal to the heating body channel. Is disclosed.
  • Patent Document 2 a plurality of ceramic heat exchangers in which a heated fluid channel and a non-heated fluid channel are formed are arranged in a string-like sealing material made of an unfired ceramic material between the joint surfaces. There is disclosed a ceramic heat exchanger disposed in a casing with a gap interposed therebetween.
  • Patent Documents 1 and 2 have high man-hours such as sealing and slit processing, and the productivity is not good, resulting in high costs.
  • the gas / liquid flow paths are arranged in every other row, the piping structure and the fluid sealing structure are complicated.
  • the heat transfer coefficient of liquids is generally 10 to 100 times greater than that of gas, and these technologies lack the heat transfer area on the gas side and are proportional to the heat transfer area of the gas, which controls the heat exchanger performance. The heat exchanger becomes large.
  • Patent Documents 3 and 4 disclose a heat exchanger in which a honeycomb structure portion and a tube portion are separately manufactured and joined together. However, these products have a tendency to increase costs due to poor productivity.
  • Patent Document 5 discloses a heat storage body made of a ceramic honeycomb structure.
  • Patent Document 5 discloses a heat storage body made of a ceramic honeycomb structure. This is because the honeycomb structure is not specially processed, so that the manufacturing cost does not increase. However, in order to make this a heat exchanger, it is necessary to add further ideas.
  • An object of the present invention is to provide a heat exchange member having improved heat exchange efficiency using a honeycomb structure, a manufacturing method thereof, and a heat exchanger including the heat exchange member.
  • the following heat exchange member, a manufacturing method thereof, and a heat exchanger including the heat exchange member are provided.
  • a cell structure section defined by partition walls containing SiC, penetrating from one end face to the other end face, and having a cell serving as a flow path through which the first fluid flows, and an outer periphery of the cell structure section
  • At least two or more honeycomb structures each having an outer peripheral wall disposed are arranged in series, and the first fluid leaks and mixes inside each cell of the honeycomb structure outside the cell.
  • the cell structure portions of at least one set of adjacent honeycomb structures among the honeycomb structures arranged in series are arranged with a gap between the end surfaces forming the gap.
  • the first fluid flowing through each cell mixes with each other, and the first fluid flowing through the cell and the second fluid flowing outside the outer peripheral wall of the honeycomb structure are mixed.
  • First fluid and the second fluid heat exchange member for heat exchange through said outer peripheral wall of the honeycomb structure.
  • the honeycomb structure having the cell density higher than the cell density of the honeycomb structure positioned on the most inlet side of the first fluid is disposed second or later from the inlet side.
  • honeycomb structures connected in series have the same cell structure, and the position of the cell intersection of at least one other honeycomb structure is shifted from the position of the cell intersection of one honeycomb structure.
  • the heat exchange member according to any one of [1] to [3].
  • the honeycomb structure has an extended outer peripheral wall formed in a cylindrical shape extending outward in the axial direction from the end face, and the honeycomb structures are brought into contact with the extended outer peripheral wall.
  • the heat exchange member according to any one of [1] to [7], wherein the cell structure portions are arranged with a gap therebetween.
  • a metal fitting honeycomb structure including a metal pipe fitted to the outer peripheral surface of the honeycomb structure, and the metal pipe is connected to at least one end of the metal pipe so as to be connectable to the other metal pipe.
  • the heat exchange member according to any one of [7].
  • the connecting means is formed such that a diameter of one end of the metal tube is larger than a diameter of the other end, and the other end of the other metal tube is formed at one end.
  • the heat exchange member according to [9] which is connected by inserting and fitting an end portion.
  • the connecting means is formed such that a diameter of one end portion of the metal tube is larger than a diameter of the other end portion, and a protruding portion protruding in a radial direction is formed at any one of the end portions.
  • a notch that is recessed in the axial direction is formed at each of the end portions, and a notch that is not the notch of the other metal tube is fitted into the notch.
  • the thermal resistance reduction layer made of any one of a soft metal, an alloy material, and a carbon-based material is provided between the honeycomb structure and the metal tube, according to any one of the above [9] to [12] Heat exchange member.
  • the first fluid flowing in the cell is transferred from the first fluid flowing through the cells to the partition walls and the outer peripheral wall as compared with the case where no gap is made. Heat transfer is promoted and heat exchange efficiency is improved.
  • FIG. 3A It is a cross-sectional schematic diagram which shows embodiment of the heat exchange member with which honeycomb structures were connected with the metal pipe. It is a cross-sectional schematic diagram which shows embodiment of the heat exchange member by which the honeycomb structure is arrange
  • FIG. 9A was formed. It is a schematic diagram which shows embodiment by which the notch part was formed in the metal pipe.
  • Fig. 3 is a schematic diagram showing an embodiment of a heat exchange member connected by shifting the angles of cells of a honeycomb structure. It is a schematic diagram showing an embodiment of a heat exchange member connected so that the cell densities of cells of adjacent honeycomb structures are different from each other.
  • FIG. 3 is a schematic diagram showing an embodiment in which the cell density of the second honeycomb structure is higher than the cell density of the honeycomb structure on the most inlet side, and further the cell density of the third honeycomb structure is higher. It is a schematic diagram showing an embodiment in which the cell density of the second honeycomb structure is the largest and the cell density of the third honeycomb structure is the next highest.
  • FIG. 1 It is a schematic diagram showing an embodiment in which the cell density of the second honeycomb structure is increased and the cell densities of the first and third honeycomb structures are the same.
  • the honeycomb structure connected in series is the same cell structure, and the schematic diagram showing an embodiment in which the position of the cell intersection of another honeycomb structure is shifted from the position of the cell intersection of one honeycomb structure. is there.
  • Schematic showing another embodiment in which the honeycomb structures connected in series have the same cell structure, and the position of the cell intersection of another honeycomb structure is shifted from the position of the cell intersection of one honeycomb structure
  • FIG. 6 is a schematic view showing another embodiment of a heat exchange member having a graphite sheet between a honeycomb structure and a metal tube. It is a schematic diagram which shows one Embodiment of the heat exchanger containing the heat exchange member of this invention.
  • 6 is a schematic diagram showing a comparative example 1.
  • FIG. 10 is a schematic diagram showing a comparative example 2.
  • FIG. 10 is a schematic diagram showing a comparative example 3.
  • FIG. 1 is a schematic diagram illustrating Example 1.
  • FIG. 6 is a schematic diagram showing Example 2.
  • FIG. 10 is a schematic diagram showing a comparative example 4.
  • FIG. 10 is a schematic diagram showing Example 9.
  • FIG. 10 is a schematic diagram showing a comparative example 5.
  • FIG. 10 is a schematic diagram showing Example 10.
  • FIG. FIG. FIG. 10 is a schematic diagram showing Example 1.
  • FIG. 3 is a schematic diagram showing an end face in the axial direction of a honeycomb structure when two honeycomb structures are connected in series, the second honeycomb structure has the same cell structure as the first honeycomb structure, It is a mimetic diagram showing an embodiment which rotates centering on a central axis.
  • FIG. 4 is a schematic diagram showing an embodiment in which the cell density of the second honeycomb structure is larger than the cell density of the first honeycomb structure, and the second honeycomb structure rotates about the central axis. It is a schematic diagram showing an embodiment in which the second honeycomb structure has the same cell structure as the first honeycomb structure and the position of the cell intersection is shifted.
  • FIG. 4 is a schematic diagram showing an embodiment in which the second honeycomb structure has the same cell structure as the first honeycomb structure, the position of the cell intersection is shifted, and further rotated.
  • the heat exchange member 10 of the present invention is a cell structure having a cell 3 that is partitioned by a partition wall 4 containing SiC, penetrates from one end face 2 to the other end face 2, and serves as a flow path through which the first fluid flows.
  • the honeycomb structure 1 including the portion 8 and the outer peripheral wall 7 disposed on the outer periphery of the cell structure portion 8 is a heat exchange member in which at least two or more honeycomb structures 1 are arranged in series.
  • the first fluid flows in each cell 3 of the honeycomb structure 1 without leaking or mixing outside the cell 3. That is, the honeycomb structure 1 is formed so that the first fluid flowing in a certain cell 3 does not leak to the other cells 3 through the partition walls 4.
  • the cell structure portions 8 of at least one set of adjacent honeycomb structures 1 among the honeycomb structures 1 arranged in series are arranged with a gap 17 therebetween, thereby forming the gap 17.
  • the first fluids flowing through the respective cells 3 are mixed with each other between the end faces 2 to be mixed.
  • the first fluid flowing through the cells 3 and the second fluid flowing outside the outer peripheral wall 7 of the honeycomb structure 1 are not mixed with each other through the outer peripheral wall 7 of the honeycomb structure 1. Heat exchange between the first fluid and the second fluid.
  • FIG. 1A and 1B are schematic cross-sectional views showing an embodiment of the heat exchange member 10.
  • end portions of two honeycomb structures 1 are connected by a metal pipe 12.
  • a gap 17 is formed between the honeycomb structures 1.
  • the first fluid flowing through the cells 3 is mixed in the gap 17, and the flow state is turbulent. Turn into. Thereby, heat transfer from the first fluid to the partition wall 4 and the outer peripheral wall 7 is promoted, and the heat exchange efficiency is improved.
  • two honeycomb structures 1 are arranged with a gap 17 inside a metal tube 12.
  • the gap 17 is preferably 0.1 to 10 mm, and more preferably 0.5 to 5 mm. By setting the gap to 0.1 mm or more and 10 mm or less, heat transfer from the first fluid flowing in the cell 3 to the partition wall 4 and the outer peripheral wall 7 can be made sufficient. And heat exchange efficiency can be improved.
  • honeycomb structures 1 may be connected. In that case, it is preferable that at least one set of honeycomb structures 1 is disposed with a gap 17 between them, and it is more preferable that all the honeycomb structures 1 have gaps 17 therebetween. When two or more gaps 17 exist, they may be different from each other or the same interval.
  • FIG. 2 shows another embodiment of the heat exchange member 10.
  • the honeycomb structure 1 has an extended outer peripheral wall 7a that extends outward in the axial direction from the end face 2 and is formed in a cylindrical shape, and the honeycomb structures 1 are arranged with the extended outer peripheral wall 7a in contact with each other. Thus, the cell structure portions 8 are arranged with a gap 17 therebetween.
  • FIG. 3A shows a cross-sectional view taken along a cross section parallel to the axial direction of the heat exchange member 10 of the present invention.
  • FIG. 3B shows a view taken along arrow A in FIG. 3A.
  • This is a heat exchange member 10 (single unit) constituted by a metal fitting honeycomb structure 11 including a metal tube 12 fitted to the outer peripheral surface 7 h of the honeycomb structure 1.
  • the metal tube 12 is provided with connection means connectable to the other metal tube 12 at at least one end.
  • connection means connectable to the other metal tube 12 at at least one end.
  • the heat exchange member 10 passes through the outer peripheral wall 7 of the honeycomb structure 1 and the metal tube 12 in a state where the first fluid flowing through the cell 3 and the second fluid flowing outside the metal tube 12 are not mixed. Heat exchange between the first fluid and the second fluid.
  • the diameter of one end 12a of the metal tube 12 is formed larger than the diameter of the other end 12b. That is, one end portion 12a side of the metal tube 12 has a large diameter, and the other end portion 12b side has a small diameter to form a large diameter portion 12f and a small diameter portion 12g.
  • the small diameter of the metal tube 12 is just the diameter to which the honeycomb structure 1 is fitted.
  • the large diameter of the metal tube 12 is formed larger than the outer diameter of the honeycomb structure 1.
  • the metal tubes 12 are connected to each other by inserting and fitting the other end 12 b of the other metal tube 12 into one end 12 a of a certain metal tube 12. be able to.
  • FIG. 4 is a schematic diagram illustrating a process of manufacturing the metal fitting honeycomb structure 11 by integrating the honeycomb structure 1 and the metal pipe 12.
  • a cell 3 is formed by partition walls 4 containing SiC, penetrates from one end face 2 to the other end face 2, and serves as a flow path through which the first fluid flows, and cell 3
  • a metal tube 12 provided with connection means that can be connected to another metal tube 12 is fitted to the outer peripheral surface 7h of the honeycomb structure 1 provided with an outer peripheral wall 7 disposed on the outer periphery of
  • a metal fitting honeycomb structure 11 heat exchange member 10 as shown in FIGS. 3A and 3B is obtained.
  • the honeycomb structure 1 is arrange
  • connection between the metal fitting honeycomb structures 11, that is, the connection between the metal pipes 12, can be performed by mechanical fastening such as press fitting, shrink fitting, and caulking of the metal pipes 12.
  • metal fitting honeycomb structures 11 can be connected to each other by chemical bonding such as brazing or welding of the metal pipe 12.
  • the metal fitting honeycomb structure 11 can be used as one unit, and a plurality of metal fitting honeycomb structures 11 can be connected and used as the heat exchange member 10. For this reason, the freedom degree of design, such as opening the clearance gap 17 between the adjacent honeycomb structures 1 and making the angles of the cells 3 of the honeycomb structures 1 different from each other, is increased.
  • the metal tube 12 one having heat resistance and corrosion resistance is preferable.
  • stainless steel, titanium, copper, brass or the like can be used. Since the connecting portion is formed of metal, chemical bonding such as press fitting, shrink fitting, caulking, etc., brazing, welding, etc. can be freely selected according to the application and possessed equipment.
  • the honeycomb structure 1 is formed in a cylindrical shape with ceramics, and has a fluid flow path penetrating from one end face 2 in the axial direction to the other end face 2.
  • the honeycomb structure 1 has partition walls 4, and a large number of cells 3 serving as fluid flow paths are partitioned by the partition walls 4. By having the partition walls 4, the heat from the fluid flowing through the inside of the honeycomb structure 1 can be efficiently collected and transmitted to the outside.
  • the outer shape of the honeycomb structure 1 is not limited to a cylindrical shape (columnar shape), and a cross section perpendicular to the axial (longitudinal) direction may be an elliptical shape, a racetrack shape, or other irregular shapes. Further, the cross section may be a square or other polygons, and the outer shape may be a prism.
  • the honeycomb structure 1 is preferably made of ceramics having excellent heat resistance, and considering heat conductivity in particular, SiC (silicon carbide) having high thermal conductivity is preferably the main component.
  • the main component means that 50% by mass or more of the honeycomb structure 1 is silicon carbide.
  • the entire honeycomb structure 1 is not necessarily made of SiC (silicon carbide), and SiC (silicon carbide) may be contained in the main body. That is, the honeycomb structure 1 is preferably made of ceramics containing SiC (silicon carbide).
  • the dense body refers to those having a porosity of 20% or less.
  • Si-impregnated SiC, (Si + Al) -impregnated SiC, metal composite SiC, recrystallized SiC, Si 3 N 4 , SiC, or the like can be adopted, but a dense body for obtaining a high heat exchange rate Si-impregnated SiC or (Si + Al) -impregnated SiC can be used for the structure.
  • Si-impregnated SiC has a structure in which the SiC particle surface is surrounded by solidified metal-silicon melt and SiC is integrally bonded via metal silicon, so that silicon carbide is shielded from an oxygen-containing atmosphere and prevented from oxidation. Is done.
  • SiC has the characteristics of high thermal conductivity and easy heat dissipation, but SiC impregnated with Si is densely formed while exhibiting high thermal conductivity and heat resistance, and has sufficient strength as a heat transfer member.
  • the honeycomb structure 1 made of a Si—SiC-based [Si-impregnated SiC, (Si + Al) -impregnated SiC] material has excellent heat resistance, thermal shock resistance, oxidation resistance, and excellent corrosion resistance against acids and alkalis. And high thermal conductivity.
  • a desired shape may be appropriately selected from circular, elliptical, triangular, quadrangular, and other polygons.
  • the cell density of the honeycomb structure 1 (that is, the number of cells per unit cross-sectional area) is not particularly limited and may be appropriately designed according to the purpose, but is 25 to 2000 cells / in 2 (4 to 320 cells / cm 2 ) is preferable.
  • the cell density is smaller than 25 cells / square inch, the strength of the partition walls 4, and consequently the strength of the honeycomb structure 1 itself and the effective GSA (geometric surface area) may be insufficient.
  • the cell density exceeds 2000 cells / square inch, the pressure loss when the heat medium flows may increase.
  • the number of cells per honeycomb structure 1 is preferably 1 to 10,000, and particularly preferably 200 to 2,000. If the number of cells is too large, the honeycomb itself becomes large, so the heat conduction distance from the first fluid side to the second fluid side becomes long, the heat conduction loss becomes large, and the heat flux becomes small. In addition, when the number of cells is small, the heat transfer area on the first fluid side becomes small, the heat resistance on the first fluid side cannot be lowered, and the heat flux becomes small.
  • the thickness (wall thickness) of the partition walls 4 of the cells 3 of the honeycomb structure 1 may be appropriately designed according to the purpose, and is not particularly limited.
  • the wall thickness is preferably 50 ⁇ m to 2 mm, and more preferably 60 to 500 ⁇ m.
  • the wall thickness is 50 ⁇ m or more, the mechanical strength is improved and it is difficult to break due to impact or thermal stress.
  • 2 mm or less there is no problem that the pressure loss of the fluid increases or the heat exchange rate through which the heat medium passes decreases.
  • the density of the partition walls 4 of the cells 3 of the honeycomb structure 1 is preferably 0.5 to 5 g / cm 3 . By setting it as said range, the honeycomb structure 1 can be strengthened. Moreover, the effect which improves heat conductivity is also acquired.
  • the honeycomb structure 1 preferably has a thermal conductivity of 100 W / m ⁇ K or more. More preferably, it is 120 to 300 W / m ⁇ K, and still more preferably 150 to 300 W / m ⁇ K. By setting it as this range, heat conductivity becomes favorable and the heat in the honeycomb structure 1 can be efficiently discharged to the outside of the metal tube 12.
  • Precious metals platinum, rhodium, palladium, ruthenium, indium, silver and gold
  • the supported amount of the catalyst (catalyst metal + supported body) supported on the partition walls 4 of the cells 3 of the first fluid circulation part 5 of the honeycomb structure 1 through which the first fluid (high temperature side) passes is 10 to 400 g / L is preferable, and in the case of a noble metal, 0.1 to 5 g / L is more preferable. By setting it within this range, the catalytic action is sufficiently developed. In addition to the increased pressure loss, it is possible to prevent the manufacturing cost from increasing.
  • FIGS. 6A to 6B and FIGS. 7A to 7B show an embodiment in which a convex portion 12m and a concave portion 12n are formed on the metal tube 12.
  • FIG. 6A is a schematic diagram showing an embodiment in which convex portions 12 m and concave portions 12 n are formed on the metal tube 12.
  • FIG. 6B is a schematic view showing an embodiment of the heat exchange member 10 connected by the metal tube 12 in which the convex portion 12m and the concave portion 12n are formed.
  • FIG. 7A is a view as seen from an arrow B in FIG. 6A
  • FIG. 7B is a view as seen from an arrow C in FIG. 6A.
  • the diameter of one end portion 12a of the metal tube 12 is formed larger than the diameter of the other end portion 12b as the connecting means. Furthermore, a convex portion 12m that protrudes inward in the radial direction is formed on one end portion 12a. Further, a recess 12n that is recessed in the radial direction is formed at the end opposite to the end where the protrusion 12m is formed. As shown in FIG. 6B, the recess 12n is formed as a groove. Thereby, the metal pipes 12 are connected to each other by fitting the convex part 12 m of a certain metal pipe 12 and the concave part 12 n of another metal pipe 12.
  • FIG. 8 is a schematic diagram showing another embodiment of the recess 12n.
  • a recess 12n is formed as a bottomed groove.
  • FIG. 9A is a schematic view showing another embodiment in which a convex portion 12m is formed on the metal tube 12.
  • FIG. 9B is a schematic view showing another embodiment of the heat exchange member 10 connected by the metal tube 12 in which the convex portion 12m shown in FIG. 9A is formed.
  • a convex portion 12m protruding outward in the radial direction is formed on the other end portion 12b of the small diameter portion 12g.
  • a concave portion 12n that is recessed in the radial direction is formed at one end portion 12a, which is the end portion of the large-diameter portion 12f opposite to the end portion where the convex portion 12m is formed.
  • the metal pipes 12 are connected to each other by fitting the convex part 12 m of a certain metal pipe 12 and the concave part 12 n of another metal pipe 12.
  • FIG. 10 is a schematic diagram showing an embodiment in which a notch 12p is formed in the metal tube 12. As shown in FIG. That is, as connecting means, a notch 12p that is recessed in the axial direction is formed at each end. The remaining part other than the notch 12p is a non-notch 12q. When the non-notched part 12q which is not a notch part of the other metal tube 12 fits into the notch part 12p of a certain metal tube 12, the metal tubes 12 are connected to each other.
  • FIG. 11A it is also preferable to connect the cells 3 of the honeycomb structure 1 while shifting the angles thereof (in FIG. 11A, the metal tube 12 is depicted in a simplified manner.
  • FIG. 11G. it is also preferable that at least one honeycomb structure 1 is rotated around the central axis of the honeycomb structure 1 so that the direction of partition walls of the cells 3 is deviated from the other honeycomb structures 1.
  • the effect which increases the channel resistance of the fluid which passes cell 3 is acquired.
  • the first fluid flowing through each cell 3 is mixed with each other between the end surfaces 2 forming the gap 17. Thereby, transfer of heat with the fluid can be increased.
  • Fig. 16A is a schematic diagram showing the end face 2 in the axial direction of the honeycomb structure 1 when the two honeycomb structures 1 are connected in series.
  • the honeycomb structure 1 on the inlet side of the first fluid is shown as the first
  • the honeycomb structure 1 on the outlet side is shown as the second.
  • the second honeycomb structure 1 has the same cell structure as the first honeycomb structure 1 and rotates around the central axis as in FIG. 11A.
  • the same cell structure refers to a cell structure having the same cell shape, pitch, partition wall thickness, etc. (however, in this specification, the same cell structure includes those in which the position of the cell intersection 3a is shifted).
  • the one where the position of the cell intersection 3a is shifted may also be referred to as the same cell structure where the intersection is shifted.)
  • honeycomb structures 1 are connected in series
  • FIG. 11B it is also preferable to connect the cells 3 of the adjacent honeycomb structures 1 such that the cell densities thereof are different from each other. By doing in this way, the effect which increases the channel resistance of the fluid which passes cell 3 is acquired. Thereby, transfer of heat with the fluid can be increased. Moreover, it can also comprise so that the thickness of the partition of the honeycomb structure 1 of the inlet side and outlet side of a 1st fluid may differ.
  • FIG. 11B shows an embodiment in which the cell density of the honeycomb structure 1 on the outlet side is larger than the cell density of the honeycomb structure 1 on the inlet side.
  • FIG. 11C shows that the honeycomb structure 1 having a cell density larger than the cell density of the honeycomb structure 1 located on the most inlet side of the first fluid is arranged at the second and later (including the second) from the inlet side.
  • the cell density of the second honeycomb structure 1 is higher than the cell density of the first (most inlet side) honeycomb structure 1, and the cell density of the third honeycomb structure 1 is higher.
  • heat can be sufficiently recovered by providing the honeycomb structure 1 having a high cell density. That is, when the speed of the first fluid is high, the heat exchange efficiency can be improved by providing the honeycomb structure 1 with a higher cell density in the latter stage.
  • FIG. 11D shows another embodiment in which the honeycomb structure 1 having a cell density larger than the cell density of the honeycomb structure 1 located on the most inlet side of the first fluid is arranged second or later from the inlet side. Show.
  • the cell density of the second honeycomb structure 1 is the largest, and the cell density of the third honeycomb structure 1 is larger than the cell density of the first honeycomb structure 1, but the second honeycomb structure 1
  • the cell density of the structure 1 is smaller.
  • the honeycomb structure 1 having a high cell density is arranged second, the first fluid is suppressed while suppressing an increase in pressure loss. Can be recovered efficiently. That is, when the speed of the first fluid is low, the heat exchange efficiency can be improved by increasing the cell density of the second honeycomb structure 1.
  • FIG. 11E is also an embodiment in which the cell density of the second honeycomb structure 1 is increased.
  • the cell densities of the first and third honeycomb structures 1 are the same.
  • the heat exchange efficiency can be improved when the speed of the first fluid is high, and the pressure loss can be suppressed because the third cell density is not large.
  • the cell density of all the honeycomb structures 1 When the cell density of all the honeycomb structures 1 is increased, the pressure loss increases, but the cell density of the subsequent honeycomb structure 1 is set to the cell density of the first honeycomb structure 1 in accordance with the speed of the first fluid. By making it larger than this, the heat exchange efficiency can be improved while suppressing the pressure loss.
  • FIG. 16B is a schematic diagram showing the end face 2 in the axial direction of the honeycomb structure 1 when the two honeycomb structures 1 are connected in series.
  • the cell density of the second honeycomb structure 1 is larger than the cell density of the first honeycomb structure 1, and the second honeycomb structure 1 rotates about the central axis.
  • the heat exchange efficiency can be improved by increasing the cell density of the second honeycomb structure 1 and rotating it.
  • FIG. 11F shows that the honeycomb structures 1 connected in series have the same cell structure, and the position of the cell intersection 3a of at least one other honeycomb structure relative to the position of the cell intersection 3a of one honeycomb structure 1
  • deviated is shown. That is, the first fluid flowing into the cells 3 of the first honeycomb structure 1 is likely to hit the cell intersection 3a of the second honeycomb structure 1, in other words, easily hits the partition walls 4 of the end face 2, and heat exchange is performed. Efficiency can be improved.
  • FIG. 11F shows an embodiment in which the position of the cell intersection 3a is shifted in both the vertical and horizontal directions
  • FIG. 11G is an embodiment in which the position of the cell intersection 3a is shifted only in one direction.
  • Fig. 16C is a schematic diagram showing the end face 2 in the axial direction of the honeycomb structure 1 when the two honeycomb structures 1 are connected in series.
  • the second honeycomb structure 1 has the same cell structure as the first honeycomb structure 1, and the position of the cell intersection 3 a is shifted.
  • FIG. 16D is also a schematic diagram showing the end face 2 in the axial direction of the honeycomb structure 1 when the two honeycomb structures 1 are connected in series.
  • the second honeycomb structure 1 has the same cell structure as the first honeycomb structure 1, and the intersection cell is the same cell structure in which the position of the cell intersection 3a is shifted. Further, the second honeycomb structure 1 having the same cell structure with the intersection difference is rotating around the central axis. Since the position of the cell intersection 3a of the second honeycomb structure 1 is shifted and rotated with respect to the position of the cell intersection 3a of the first honeycomb structure 1, the cell 3 of the first honeycomb structure 1 is rotated. The first fluid that has passed through can easily hit the position of the cell intersection 3a of the second honeycomb structure 1 and can improve the heat exchange efficiency.
  • heat for reducing the contact thermal resistance at the interface and improving the heat exchange efficiency between the honeycomb structure 1 and the metal tube 12 fitted to the outer peripheral surface of the honeycomb structure 1 is shown.
  • 1 shows an embodiment of a heat exchange member 10 having a resistance reduction layer 13.
  • the material of the thermal resistance reducing layer 13 is preferably a soft metal such as aluminum, copper, or lead, an alloy material such as solder, or a carbon-based material such as graphite sheet.
  • the metal tube 12 and the honeycomb structure 1 can be fitted by shrink fitting with the thermal resistance reduction layer 13 sandwiched therebetween.
  • the first fluid and the second fluid can be prevented from being mixed.
  • FIG. 13 shows a perspective view of the heat exchanger 30 including the heat exchange member 10 of the present invention.
  • the heat exchanger 30 is formed by a heat exchange member 10 and a casing 21 that includes the heat exchange member 10 therein.
  • the cells 3 of the honeycomb structure 1 become the first fluid circulation part 5 through which the first fluid flows.
  • the heat exchanger 30 is configured such that a first fluid having a temperature higher than that of the second fluid flows in the cells 3 of the honeycomb structure 1.
  • an inlet 22 and an outlet 23 for the second fluid are formed in the casing 21, and the second fluid circulates on the outer peripheral surface 12 h of the metal tube 12 of the heat exchange member 10.
  • the second fluid circulation portion 6 is formed by the inner surface 24 of the casing 21 and the outer peripheral surface 12 h of the metal tube 12.
  • the second fluid circulation part 6 is a second fluid circulation part formed by the casing 21 and the outer peripheral surface 12 h of the metal tube 12, and the first fluid circulation part 5 and the partition walls 4 and the outer peripheral walls of the honeycomb structure 1. 7.
  • Heat conduction is performed by being separated by the metal pipe 12, and the heat of the first fluid flowing through the first fluid circulation portion 5 is received via the partition wall 4, the outer peripheral wall 7, and the metal pipe 12, and is distributed. Heat is transferred to the heated object which is the second fluid.
  • the first fluid and the second fluid are completely separated, and these fluids are configured not to mix.
  • the heat exchanger 30 circulates the first fluid having a temperature higher than that of the second fluid and conducts heat from the first fluid to the second fluid.
  • gas is circulated as the first fluid and liquid is circulated as the second fluid, heat exchange between the first fluid and the second fluid can be performed efficiently. That is, the heat exchanger 30 of the present invention can be applied as a gas / liquid heat exchanger.
  • the heating element that is the first fluid to be circulated in the heat exchanger 30 of the present invention having the above configuration is not particularly limited as long as it is a medium having heat.
  • the medium to be heated which is the second fluid that takes heat from the heating body (exchanges heat)
  • a clay containing ceramic powder is extruded into a desired shape to produce a honeycomb formed body.
  • the material of the honeycomb structure 1 the above-described ceramics can be used.
  • the honeycomb structure 1 mainly composed of a Si-impregnated SiC composite material
  • a predetermined amount of C powder, SiC powder, binder is kneaded to form a clay and molded to obtain a honeycomb molded body having a desired shape.
  • the honeycomb structure 1 in which a plurality of cells 3 serving as gas flow paths are partitioned by the partition walls 4. Subsequently, the temperature of the metal tube 12 is raised, and the honeycomb structure 1 is inserted into the metal tube 12 and integrated by shrink fitting to form the heat exchange member 10. Note that the honeycomb structure 1 and the metal pipe 12 may be joined by brazing, diffusion bonding, or the like in addition to shrink fitting. By disposing the heat exchange member 10 in the casing 21, the heat exchanger 30 can be obtained.
  • honeycomb formed body Next, the kneaded material was extruded to form a honeycomb formed body.
  • the base was made of a hard metal that does not easily wear.
  • the honeycomb molded body was formed such that the outer peripheral wall 7 was formed into a cylindrical shape and the inside of the outer peripheral wall 7 was divided into square lattices by the partition walls 4. Further, these partition walls 4 were formed so as to be parallel to each other at equal intervals in each of the directions orthogonal to each other and to cross the inside of the outer peripheral wall 7 straightly. Thereby, the cross-sectional shape of the cell 3 other than the outermost peripheral portion inside the outer peripheral wall 7 was made square.
  • the honeycomb formed body obtained by extrusion molding was dried.
  • the honeycomb formed body was dried by an electromagnetic heating method, and subsequently dried by an external heating method.
  • moisture corresponding to 97% or more of the total moisture contained in the honeycomb formed body before drying was removed from the honeycomb formed body.
  • the honeycomb formed body was degreased at 500 ° C. for 5 hours in a nitrogen atmosphere. Further, a lump of metal Si was placed on the honeycomb structure 1 obtained by such degreasing and fired at 1450 ° C. for 4 hours in an inert gas under vacuum or reduced pressure. During the firing, the lump of metal Si placed on the honeycomb structure 1 was melted, and the outer peripheral wall 7 and the partition walls 4 were impregnated with metal Si.
  • the thermal conductivity of the outer peripheral wall 7 and the partition walls 4 was set to 100 W / m ⁇ K, a mass of 70 parts by mass of metal Si was used with respect to 100 parts by mass of the honeycomb structure.
  • a heat exchange member 10 was manufactured by fitting a stainless steel metal tube to the outer peripheral surface 7h of the honeycomb structure 1 (see FIG. 1B). The more detailed form of the heat exchange member 10 will be described below when each example and each comparative example are individually described.
  • the heat exchange member 10 was arranged in a casing 21 made of stainless steel (see FIG. 13).
  • Example 1 is a schematic diagram showing Comparative Example 1
  • FIG. 14B is Comparative Example 2
  • FIG. 14C is Comparative Example 3
  • FIG. 14D is Examples 1, 3 to 8, and
  • FIG. 14E is Example 2. These figures are drawn in a simplified manner and show the arrangement of the honeycomb structure 1).
  • the heat exchange member 10 is configured by one honeycomb structure 1.
  • Comparative Example 2 is two honeycomb structures 1
  • Comparative Example 3 is a structure in which the heat exchange member 10 is composed of five honeycomb structures 1, but the honeycomb structures 1 are in close contact with each other without a gap 17. Are arranged.
  • the heat exchange member 10 is constituted by five honeycomb structures 1 and the honeycomb structures 1 are arranged with a gap 17 ("Gap between honeycomb structures” in Table 1). "reference).
  • the cell directions are aligned, but in the second embodiment, the cell directions are shifted.
  • the cell structures are aligned and the honeycomb structures 1 are arranged with a gap 17 therebetween, but the gaps 17 are different.
  • Test heat exchange efficiency test
  • Nitrogen gas (N 2 ) was used as the first fluid, and a flow rate of 15 g / s was passed through the first fluid circulation part 5 of the honeycomb structure 1 at 350 ° C.
  • a flow rate of 10 L / min was passed through the second fluid circulation portion 6 in the casing 21 at 40 ° C.
  • Table 1 shows the heat exchange efficiency.
  • Examples 1 to 8 having gaps 17 between adjacent honeycomb structures 1 have the same overall length as that of Comparative Examples 1 to 3, and are compared even though the contact area of the first fluid is small. Compared with Examples 1 to 3, the heat exchange efficiency was improved. In Example 8, the heat exchange efficiency is small compared to Comparative Example 3, but it can be said that the heat exchange efficiency is improved because the length of the honeycomb structure 1 is short. However, it can be said that the effect of improving the heat exchange efficiency by the gap 17 is reduced by setting the gap 17 to 11 mm (Example 8). Therefore, the gap 17 is preferably 0.1 to 10 mm. In addition, the heat exchange efficiency was improved in Example 2 in which the directions of the cells were shifted and arranged compared to Example 1 in which the directions of the cells were aligned. The total length of Examples 1 to 8 is the same as that of Comparative Examples 1 to 3, but the pressure loss of Examples 1 to 8 is smaller than that of Comparative Examples 1 to 3.
  • Example 9 and 10 Comparative Examples 4 and 5
  • 15A is a schematic diagram showing a comparative example 4
  • FIG. 15B is a ninth example
  • FIG. 15C is a comparative example 5
  • FIG. 15D is a schematic diagram showing the tenth example.
  • the heat exchange member 10 is configured by one honeycomb structure 1.
  • the heat exchange member 10 is constituted by three honeycomb structures 1 having different cell densities. The left side of the figure is upstream (inlet side), and the right side is downstream (outlet side).
  • Example 9 was arranged with a gap 17 between adjacent honeycomb structures 1 and the cell density on the upstream side was reduced, so that the heat exchange efficiency was improved and the pressure loss was reduced. Further, in comparison with Comparative Example 5, Example 10 is arranged with a gap 17 between adjacent honeycomb structures 1 and the cell density on the upstream side is reduced, so that the contact area of the first fluid is reduced. Nevertheless, the heat exchange efficiency was improved and the pressure loss was reduced.
  • the heat exchange member of the present invention is not particularly limited even in the automotive field and the industrial field as long as it is used for heat exchange between a heated body (high temperature side) and a heated body (low temperature side). In particular, it is suitable when at least one of the heated body or the heated body is a liquid. When used for exhaust heat recovery from exhaust gas in the automobile field, it can be used to improve the fuel efficiency of automobiles.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Ceramic Engineering (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)

Abstract

L'invention concerne un élément d'échange de chaleur qui utilise une structure en nid d'abeille et présente un meilleur coefficient d'échange thermique, une méthode de fabrication de l'élément d'échange de chaleur, et un échangeur de chaleur qui comprend l'élément d'échange de chaleur. Un élément d'échange de chaleur (10) comprend au moins deux structures en nid d'abeille (1) arrangées en série, les structures en nid d'abeille (1) comprenant une partie structurelle cellulaire comportant des cellules définies par des parois contenant du SiC et dotées de canaux dans lesquels un premier fluide circule en s'écoulant d'une extrémité à l'autre, et une paroi circonférentielle située sur la circonférence de la partie structurelle cellulaire. Le premier fluide circule à l'intérieur des cellules des structures en nid d'abeille (1) sans fuir vers l'extérieur ni se mélanger. Au moins une paire de parties structurelles cellulaires dans les structures en nid d'abeille (1) sont placées côte à côte avec un interstice (17) entre elles parmi les structures en nid d'abeille (1) arrangées en série, et le premier fluide circulant à l'intérieur des cellules se mélange entre les extrémités qui créent l'interstice (17).
PCT/JP2012/064814 2011-06-10 2012-06-08 Elément d'échange de chaleur, méthode de fabrication de celui-ci et échangeur de chaleur WO2012169622A1 (fr)

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CN201280027515.XA CN103582798B (zh) 2011-06-10 2012-06-08 热交换部件、其制造方法、以及热交换器
JP2013519546A JP6006204B2 (ja) 2011-06-10 2012-06-08 熱交換部材、その製造方法、及び熱交換器
EP12797403.8A EP2719987B1 (fr) 2011-06-10 2012-06-08 Elément d'échange de chaleur, méthode de fabrication de celui-ci et échangeur de chaleur
US14/095,279 US10527369B2 (en) 2011-06-10 2013-12-03 Heat exchanger element, manufacturing method therefor, and heat exchanger

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JP2011129677 2011-06-10
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JP2012-025750 2012-02-09

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JP6006204B2 (ja) 2016-10-12
US10527369B2 (en) 2020-01-07
CN103582798B (zh) 2016-03-09
EP2719987A4 (fr) 2014-12-03
CN103582798A (zh) 2014-02-12
EP2719987A1 (fr) 2014-04-16
US20140090821A1 (en) 2014-04-03
EP2719987B1 (fr) 2018-05-09
JPWO2012169622A1 (ja) 2015-02-23

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